He can threaten nuclear war, but sure not on the United States. His missiles minus an attached nuclear warhead barely made it past Japan. While he doesn't have extensive long range missile technology we should just go bomb his country back into the stone age. Then the threat disappears.

Doubtful, if you read anything about the dude he wants to kick back and be idolized and worshipped, NOT to start a war whose outcome destroys his entire legacy. He wants to make hollywood movies, play golf like tiger, or at least be acknowledged as such.

It's scary a crazy person has the bomb but he wants it as a carrot, not a stick.